Adjustable gas tube



FIG. 1 is a front perspective view of an adjustable gas tube showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a side elevational view of another embodiment thereof;

FIG. 7 is a front elevational view thereof;

FIG. 8 is a side elevational view of another embodiment thereof; and,

FIG. 9 is a front elevational view thereof. 

The ornamental design for the adjustable gas tube, as shown and described. 